Surface and contour grinder



M y 1945- I A. PlZ-ZIGONI 2,375,323 I SURFACE AND CONTOUR GRINDER Filed Feb. 19, 1944 5 Sheets-Sheet 1 Inventor y 1945- A. PIZZIGONI 2,375,323

SURFACE AND CONTOUR GRINDER Filed Feb. 19, 1944 5 Sheets-Sheet 2 jifred .Pz'zzzjoaz z ,1 Q wig E Inventor y 1945- A. PIZZIGONI 7 2,375,323

SURFACE AND CONTOUR GRINDER Filed Feb. 19, 1944 s Sheets-Sheet s I m'c'u for May 1945- I I A. PIZZIGONI 2,375,323 I SURFACE AND CONTOUR GRINDER Filed Feb. 19, 1944 5 Sheets-Sheet 4 I ,gzffiadf zz y on 5 Patented May 8, 1945 UNITED STATES OFFICE.

4 Claims.

This invention relates to new and useful improvements in grinding machines, the principal object of the invention being to provide a grinding machine wherein the grinder itself reciprocates, instead of the table, which is usually the medium of operation, this with a view toward utilizing the grinder element for contour grinding.

Another important objectof the invention is to provide a grinder which can be used either for surface or contour'grinding and wherein adjustability can be accomplished to take care of various contingencies and requirements.

Other objects and advantages of the invention will become apparent to the reader of the following description.

In the drawings:

Figure lreprese'nts a front elevational view of the machine. I

Figure 2 is a top plan view with the cover, motor and certain other elements removed.

Figure 3 is a fragmentary vertical sectional view through the machine.

Figure 4 is a vertical sectional view taken substantially on the line 4-.-4 of Figure 6.

Figure 5 is a cross sectional view taken substantially on the 5--5 of Figure 7.

Figure 6 is a fragmentary longitudinal sectional view through the motor and clutch unit. v

Figure '7 is a fragmentary detailed sectional view, looking downwardly, on the motor and'clutch unit.

Figure 8 is an elevational view of one of the clutch operating cams.

Figure 9 is a fragmentary vertical sectional view through a modified form adapted for contour grinding.

Figure 10 is a fragmentarydetailed-sectional view taken substantially on the line |l0 of Figure 9. l v

Figure 11 is a sectional view taken substantiall on the line ll--l I of Figure 10.

Figure 12 is a perspective view of a, pattern'or form plate shown in corresponding position to a piece of work defined thereby.

Referring to the drawings wherein likenumerals designate like parts, it can be seen that numeral denotes a vertically disposed shell suitably supported upon a base or foundation. The top of this shell 5 has short upstanding end walls 6, S

between which extends a guide bar I and a rack bar 8. These bars 1, 8 extend through a housing 9 of a motor and clutch unit generally referred to by numeral H], which housing has a barrel H projecting forwardly therefrom and through 55 which a driven shaft I2 is disposedand equipped at its outer end with a grinding wheel l3.

Here it Will be understood, that the unit it is to reciprocate back and forth on the bars 1 and; 8 in straight surface grinding operation.

The inner end of the shaft I2 carries a pinion Hi which meshes with a gear {5 on a drive shaft I5.- The drive shaft I6 is in fact an armature shaft, having an armature ll thereon in electromagnetic relation with respect to a field l 8, these parts going togetherto-make up an electric motor.

The inner end of the shaft It carries a pinion H] which meshes with an underlying gear 20 lo-. cated on a stub shaft 2! supported by a vertical partition 22a in the housing 9. I .1 Y I As shown in Figure 4, on the shaft 2| is a pinion 22 meshing with a gear 24 located on a shaft 25 this shaft being disposed through support 26, 21, and having a pinion 28, at its rear end.- The gear 24meshes with a second gear of equal size and denoted by numeral 29, located. on a shaft disposed through the supports 26 and 3|. At the rear end of the shaft 30 isa pinion 33 andthis meshes with a gear 34 located to rotate on the shaft 35. There is asecond gear 36 on theshaft with which meshes the pinion 28, This -gear,36

is also free to rotate on the shaft 35 when notion-i:

gaged by a clutch element 31 which'is keyedto the shaft 35 and is operated by a rockable finger 38, the same having a yoke 39 at its upper end engag ing in the circumferential groove of the clutch element 31.. I l p A detent for the clutch element 31 consistsof a vertically disposed and pivoted arm 4!) having its lower end engaged into the circumferential groove of the clutch element 31, while itsupper end projects through an opening in the housing 9 and is equipped with a ball or weighed head 4!. 0b}

viously, by actuating this head 4 the clutchj can be controlled manually.

Keyed to the clutch shaft .35 i s a ge r '42 f meshes with the rack bar 8.

Secured at predetermined points on acarri er" rod 43 located horizontally within the shell Fare.

collars 44 secured in place by wing screws 45am these have angularly set 'platesmr cams E6 thereon, forthe purpose of deflecting thelower'endsof the: finger 38 to reverse the clutch mechanism, thus" A vertically disposed screw-shaft 52 has its upper and lower ends journaled in bearings 53, 54, the upper'portion of this shaft 52 being equipped with a beveled gear 55 meshing with a bevel gear 56 on a horizontal shaft 51 which extends through one end of the shell and there equipped with a hand wheel 58.

block being provided with nut structures 59. Thus by rotating the hand wheel 58, the block 56 can be vertically adjusted for elevating and lowering the table 41.

The table 41 has a shaft 60 journaled horizontally therethrough and this extends through a. vertical slot 6| in the front of the shell 5 and is threaded as at 62 for feedable disposition through the block 50. Thus the table 41 is horizontally adjustable.

The guide bars 48 extending from the table 41 extend through vertical slots 63 in the, front wall of the shell 5. V

Thus it can be seen that instead of the table reciprocating as in most surface grinders, the grinder and motive means reciprocate in the present invention, and this is principally so that the means for contour grinding can be readily associated with this above described machine.

Now, concerning the means for adapting the present machine to contour grinding, Figures 9 v to 12, should be inspected.

I In contour grinding, it is necessary to use a form 'or pattern'plate such as shown in Figure 12 and denoted by reference character 65. This plate has a slot66 therein conforming with the form of cut desired. In Figure 12, a piece of work 61 is shown after having been ground by the contour grinding means shown in Figures 9, 10 and 11 in conjunction with the pattern plate 65.

In carrying out the present invention insofar as the contour grinding feature is concerned, it can be seen that the pattern plate 65 is mounted "on the upper portion of the front wall of the shell 5. Instead of the wheel [3 at the outer end 'of vthe shaft IZ'the shaft 12a in the present ing with a beveled gear 11 on a short horizontal i shaft 18 which extends through a barrel 19 projecting forwardly from the box and carried by this short shaft 18 is a grinding wheel 86.

Rising from the box 15 is a sleeve 8i which telescopes a barrel 82 depending-from the inner end of the housing 69. A boss 83 projects rearwardly fromthe sleeve 8| and into the slot 66 The screw 52 extends downwardly through'the block 50, the

provided with a set screw 84 for securing the sleeve 8i to the barrel 82 when the contour grinding attachment is to be demounted from the machine.

Obviously, as the grinder and the motor unit travel back and forth on the bars 1 and 8, the sleeve 8| will be elevated and lowered by the guiding action of the form or pattern plate 65 with respect to the boss 63, with the result that the grinder wheel 80 will be raised and lowered to conformingly act on the work, as for instance, the work; 61 in Figure 12.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as invention. what is casing reciprocating'with said unit and for reversing the drive to the gear.

2. A grinding machine comprising a table, a motor unit, a grinder operated by the motor unit, and means for adjusting the table including a horizontal carriage bar slidably mounted at its ends for vertical adjustment, a pair of horizontal table-supporting bars slidably extended transversely through said carriage bar adjacent opposite ends of the carriage bar, a screw feed shaft 40 threaded transversely through the carriage bar intermediate the table-supporting bars, a second screw feed shaft extended vertically and centrally through saidcar riage bar, and an operating shaft for the second screw feed shaft geared thereto.

3. A grinding machine comprising a table, a motor unit, a grinder operated by the motor unit,

-said motor unit being mounted for reciprocation with respect to the table in an invariable horizontal path, said grinding element being adapted to freely move vertically and reciprocating with said motor unit, a form plate including a form slot, said grinder'being provided with a stud disposed into the slot, said slot and stud coasting when the grinder reciprocates to move said grinder vertically. j

4. A contour grinding machine comprising a motor unit mounted to reciprocate in an invariable horizontal path, a table, a stationary pattern plate, a vertically movable grinder unit reciprocating with the motor unit, drive'means between the motor unit and the grinder unit,

of the pattern plate 65. v Obviously, the sleeve 8! is free to move up and down on the barrel 82 as guided by the form or pattern plate and the disposition of the grinding wheel is responsive to this action. The sleeve 8| may be ALFRED PIZZIGONI. 

